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Old style 36C03-251 pilot won't stay lit. Changed thermocoupe with no luck.

Bumped temp up while furnace was running. Shortly after, it just quit. A quick check showed the pilot went out. Changed the thermo couple with a new one with no luck. Still won't stay lit when I let up on the pilot button.

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  • Water Heaters Master
  • 33,359 Answers

The replacement thermocouple may be bad

Posted on Dec 08, 2012

  • 1 more comment 
  • saleen49 Dec 08, 2012

    Tried a third thermocouple but still no pilot.

  • Tom Chichester Dec 08, 2012

    That pretty much leaves adjustment of the pilot or diagnosis/replacement of the supply valve

  • saleen49 Dec 16, 2012

    The gas valve has two terminals just below the thermal couple port. Two wires run to a sensor locatedjust above the burners. Jumping these two wires together allows the pilot to stay lit. I have no idea the name of this sensor. It looks like a diode and seems to monitor the internal operating temperature.

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Posted on Jan 02, 2017

SOURCE: Rheem 22V50F1 pilot won't stay

If pilot lights and flame is robust and clear blue, and pilot goes out later, then some suspects can be excluded: air in gas line, low gas pressure, thermocouple is overtightened (finger-tight + 1/4 turn), thermocouple not positioned correctly in the flame, dirty pilot tube.
If flame is yellowish and small: then clean pilot tube and combustion parts.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean
Remaining suspects can include: air in gas line, low gas pressure, bad gas control valve, tight house so household vent fans pull air down water heater vent that blows out pilot, hot attic with inadequate ventilation, water dripping down vent.

Open following links to read troubleshoot resources.
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Posted on Aug 17, 2011

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1) Get more air to the water heater and see if problem continues.
2) Read the following pdf-s for things that might apply to your situation.
http://waterheatertimer.org/images/Negative-pressure.jpg
http://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdf
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3) Read pdfs above first, and then Add a comment with missing information below, for possible do-it-yourself help.
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http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean
Remaining suspects can include: air in gas line, low gas pressure, bad gas control valve, tight house so household vent fans pull air down water heater vent that blows out pilot, hot attic with inadequate ventilation, water dripping down vent.

Open following links to read troubleshoot resources.
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

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